Jump to content
Mhuntley73

Grinding noise only when all wheel drive is working

Recommended Posts

I have a 3.5 2016 Ford Edge. Last week heard a grind noise, which sounded like brake pad worn and grind. Changed out all the pads and rotors, which were worn but not bad. The grinding noise is still present. Almost like metal on metal sound. I’ve checked the PTU doesn’t show any sign of leakage, even checked the fluid level which was fine. Bearings seem fine by doing a drive way check for any play they seem tight. For the life of me I have been trying to figure the grind out for a week now. There is no performance loss at all, grind as mentioned only does it when all wheel drive is working once it goes to front wheel drive it is back to normal quiet drive again. When coasting sound is not present either.

When driving you hear it more coming from passenger side. Sitting in the passenger seat you can barely hear it. Now yesterday advanceTrac and hill start came on but when I hit ok hasn’t came back on again.  Any suggestions would be very helpful. 

Also should have mentioned when just starting up seems normal for about 10 mins of driving then once starting and stopping at lights after that it starts the grind or metal on metal sound.

Edited by Mhuntley73

Share this post


Link to post
Share on other sites

Grinding can also come from ABS components / traction control in action.  It is hard to distinguish traction control from AWD and ABS as they all work together to provide their functionality.

 

Passenger side would be cause to check the PTU fluid more closely, maybe run a test for ferrous particles..  How many miles do you have on it?

 

It MAY be perfectly normal tho, given that you have inspected the usual suspects and found nothing.

Share this post


Link to post
Share on other sites

It has 134000kms on it. Just now went to back up in the driveway after coming back from work and it was almost as the wheels were locked up in reverse. Put in drive and what ever it is wouldn’t let it coast forward until I gave it a bit of gas which then popped and moves freely again.

Share this post


Link to post
Share on other sites
On 2/1/2020 at 4:41 PM, Mhuntley73 said:

I’ve checked the PTU doesn’t show any sign of leakage, even checked the fluid level which was fine.

I also suggest that you take a closer look at the PTU.

Share this post


Link to post
Share on other sites

Check the RDU and the driveshaft in that case.  RDU is not nearly as frequent a failure point as the PTU, but it does fail albeit with the same symptoms as the PTU.

 

Symptoms might also fit a sticking caliper, need to remove and inspect.  Rear calipers more frequently have an issue than the fronts since they serve doubleduty as master brakes and parking brake.  Especially if you park on a hill and use the parking brake.  That is the brakes locked up after getting hot, heatsoaking, and causing all kinds of problems if left that way longterm, especially in humid weather or freezing conditions.

Share this post


Link to post
Share on other sites

Had to take it in to Ford to have it looked at. They found that the differential is pooched! Not a happy camper it will cost just over 2500 to replace. ☹

 

 

Edited by Mhuntley73

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×